-60fps looks mostly fantastic, it also lets you react to enemies faster

-Mechanics of EXP 0 & LV1 are unchanged, so it's the same type of experience as the other versions

-Terra/Lingering Will is unchanged mechanically, just a couple side effects of 60fps problems, but AI is the same

-In fact, no AI was changed at all!

-Trinity Limit seems more effective now, slightly. Likely due to 60fps side effect, this isn't really an actual "pro" though

-English version has fixed Xemnas 1 crash, you can go safely Limit Form in the fight now

-English version no longer seems to have fight opening lag pauses, such as on Larxene AS or Cerberus

Cons:

-The game can save crash, seemingly anywhere at any time. I crashed twice in two playthroughs, and I play through very fast (LV1 file in about 6 hours, plat file in about 15 hours). Many others now have save crashed since English came out.

-Other crashes seem to now exist, someone crashed simply choosing a place for the Pirates ship to go to, while someone crashed on the load screen after Dancer fight before Demyx, and someone crashed on Armor Xemnas 2 when dying to buildings

-60FPS broke a bunch of physics, which ruins a lot of mechanics design

-A bunch of things in the game are still 30fps (aside from cutscenes), such as projectiles or enemies (1k heartless), looks out of place

-Final Xemnas' Reaction Command STILL is not fixed. It still does not show up to the point where it's rare to get through the throw move without getting hit randomly. Before someone claims you have to time it now, nope, not true.

-Quick Run's movement was fixed in 1.02 patch, but still not as good as PS2/PS3 Quick Run

-Timeless River's 2nd window Reaction Command no longer works most of the time, leading you to fall into attacks (have fun on Proud/Crit playthroughs)

-Sounds are still missing and such, only Xigbar's DM is for some reason normal again (tons of missing boss quotes)

-Vexen Data is completely ruined now (60fps problem), the data circle charges not only during the opening cutscene, but so fast that it is already at 1 full bar at the start of the fight, which means Anti-Sora is immediately on the field. It maxes out to 5 within about 10s of standing on it. Casually, this fight is now a disaster. Desperation Move skip already found for speedrunning though.

-Saix Data is pretty ruined now too, in his DM phase he will almost never do a normal move after DM unless you provoke him with magic or attack. So casually someone has to figure out to provoke him to attack or they'll never get him out of Berserk mode, unlike all other versions of KH2FM

-Xigbar Data teleports much faster now with the above double or triple shooting patterns (not exactly a con, just observation)

-Due to physics 60fps problem, most things that involve launching enemies or objects go at a much lesser distance, messing with mechanics. Roxas, for example, can recover extremely fast getting launched by Guard Break

-Grim Reaper 2's Reaction Command on the Chest is messed up. Now it auto cancels every certain amount of medals, making it harder to quickly put in all medallions in last phase and allowing Grim Reaper the ability to suck them back up from the chest easier

-Final Form drains faster now using Firaga on enemies, likely due to 60fps allowing more hits to connect, thus draining Drive Faster, but also dealing slightly less damage in the process somehow

-Experiement Crash still exists, but also has existed in all forms of KH2, so not surprising it still exists

-Duck Flare is back to normal in PS4 JP (in PS3 English it lasted very long for some reason)

-Terra/LW's whip move has a weird animation at the start of it on bottom right of screen, just weird, nothing actually bad

-Terra/LW's punch move can't be just single Guarded now. Due to 60fps problem, you have to Guard + Dodge Roll/Quick Run away from him or you get hit

-For Terra/LW combo, if you end with Guard Break + Explosion on this version after hitting his Revenge Value the physics won't push him far enough away from you after Guard Break brings you close that you'll auto get hit by his whip (auto death on LV1)

-Still no soft reset, yet every other KH game ever still continues to have them...

-Wisdom Form/Final Form on stairs is apparently a bit off, haven't messed with them myself though, prob not a big issue

*English Exclusive Bugs*

-Lag pauses on English only seem to happen if streaming from PS4 same time as playing. This did not happen on JP, no idea if PS4 Slim or Pro are an issue.

-Duck Flare finisher is still longer in English. No idea why, clearly not intentional, same bug was in PS3 English 2.5

Speedrunning Notes:

-Load times are incredible for runs, Drives load instantly (though that can be a con if you don't take notice on some strats)

-Roxas strat randomly will fail due to Roxas sometimes not getting launched high enough, if during the time you have to throw an Ether

-Grim Reaper 2 you have to mash the RC now after safely freezing GR2 to not get wrecked

-Due to Trinity Limit being unintentionally buffed, it has more potential in some strats

-Axel Data now retreats into wall if you hit his Revenge Value with a Blizzaga finisher, ruining the normal strat from PS2/PS3

-Saix Data strat no longer works, due to 60fps not launching him far enough, he'll randomly hit you too soon before Reflega

-Xaldin Data opening strat may not work fully now due to Jumps not sending him high enough, according to Mace

-Final Xemnas (and Data) of course can't use the PS2 strats, due to RC drops

KH 1.5

Pros:

-Load times are very fast, just not as fast as 2.5 PS4

-60fps looks great, lets you react faster and combo faster seemingly

-Difficulty trophies stack now (though for Unchanging Armor & Undefeated, it's a far better idea to do that on Beginner)

-Ars Arcanum loads fine in fights now

-EXP 0 still intact, aka you can never be OHKOed while it's on at LV1

-The game seems possibly more stable than 1.5 PS3, load crashes seem to still exist, but not too often

-Infinite Roll Glitch no longer works due to 60fps messing with Dodge Roll (not really a con, this glitch was always pretty funny to showcase though)

-Riku Ansem's DM is MUCH faster now, prob tied to framerate. Although due to how Sora on the ground has iframes when he gets hit, casually it's probably a benefit to get free dodges

-Sound effects are utter garbage now. Finishers sound like smacking someone with paper most of the time, and many sounds don't even play, such as enemy deathes, or Sephiroth hitting you, or even telling you he's about to fire pillar

-Simba Crash still exists (if Simba is out and jumps at end of fadeout in a fight, game will crash)

-100 Acre Woods Pooh Swing mini-game timing is all screwed up now

-Tigger's English VA grunts play in JP version of mini-game (not really a con)

-Sephiroth's meteor move now insanely fast, move likely tied to fps

-Sephiroth's Octaslash move is ruined now, he stays on top of you so that you can never Dodge Roll the entire move like previous versions. Have not tested Guarding yet, obviously Strike Raiding through it solves all problems though

-Players have told me about crashing on Shadows early game & crashing on Search Ghosts later on. No idea what causes it, and have not seen a video yet, but at least 5 people have told me for each one, so it likely is an issue

Speedrunner Notes:

-Fastest version of KH1 to date

-60fps ruined a bunch of small movement tricks. Anything that you used to be able to Dodge Roll over no longer works

-Mist says you have far less iframes on Gummi Ships now

-Goofy Tornado is different now, but more effective Mist says

-EXP 0 Damage Storage glitch still works

-Riku Ansem loop has a different timing now, a bit harder to get a handle on if you do ground loop strat

-You can no longer open menu after Behemoth in Final Rest before the actual Final Rest fight, meaning you'd want to equip a Megalixir and use it after defeating Behemoth

KHRECoM

Pros:

-Fast loads obviously

-Icons for cards are a bit different

-Difficulty Trophies stack now (thank you)

Cons:

UPDATED 4/4/17:

-Audio bugs seem to happen here to as 1.5/2.5

-One of Vexen's Slights reported to be much faster than usual by Sonicshadowsilver2

-Someone showed a room crash during Calm Bounty, with distortion

KHBBS

Pros:

-Fast loads etc

-Dlinks & Command Styles load fine now of course (thank you PS4)

Cons:

UPDATED 4/4/17:

-Tornadoes in Keyblade Graveyard are fixed in English, but still too fast on JP (not sure why it's fine in English)

-Terra has to actually defeat Vanitas now in his final battle with him instead of just lower his HP (this could be an actual intentional change, possibly not exactly a con either?)

REPORTED CRASHES & BUGS:

The following below will be a big collection of all the crashes & bugs I've come across or been notified by others about.